Crystal structures and phase transitions in a-site deficient perovskites Ln1/3TaO3

Qingdi Zhou; Paul J. Saines; Neeraj Sharma; Jimmy Ting; Brendan J. Kennedy; Zhaoming Zhang; Ray L. Withers; Kia S. Wallwork

doi:10.1021/cm8014868

Crystal structures and phase transitions in a-site deficient perovskites Ln_1/3TaO₃

Qingdi Zhou, Paul J. Saines, Neeraj Sharma, Jimmy Ting, Brendan J. Kennedy, Zhaoming Zhang, Ray L. Withers, Kia S. Wallwork

Research output: Contribution to journal › Article › peer-review

32 Citations (Scopus)

Abstract

The synthesis and structures of the perovskites Ln_1/3TaO ₃ are described. As the size of the Ln cation is reduced, the compounds display a sequence of structure: P4/mmm/La → Cmmm/Ce-Gd → Pmma/Tb, Dy → Pmc2₁/Ho, Er. Although apparently tetragonal in P4/mmm, electron diffraction patterns of Tm_1/3TaO₃ reveal this has a complex incommensurate structure. Likewise Gd_1/3TaO ₃ appears metrically tetragonal, but electron diffraction and synchrotron X-ray powder diffraction demonstrate this is actually orthorhombic. The suppression of the spontaneous orthorhombic strain in Gd _1/3TaO₃ is thought to be due to the proximity to the first-order Cmmm-Pmma transition. Variable temperature studies show both Tb _1/3TaO₃ and Dy_1/3TaO₃ undergo a first-order Cmmm-Pmma transition upon heating.

Original language	English
Pages (from-to)	6666-6676
Number of pages	11
Journal	Chemistry of Materials
Volume	20
Issue number	21
DOIs	https://doi.org/10.1021/cm8014868
Publication status	Published - 11 Nov 2008

Access to Document

10.1021/cm8014868

Cite this

@article{082454965b204510b96f8f3bff780849,

title = "Crystal structures and phase transitions in a-site deficient perovskites Ln1/3TaO3",

abstract = "The synthesis and structures of the perovskites Ln1/3TaO 3 are described. As the size of the Ln cation is reduced, the compounds display a sequence of structure: P4/mmm/La → Cmmm/Ce-Gd → Pmma/Tb, Dy → Pmc21/Ho, Er. Although apparently tetragonal in P4/mmm, electron diffraction patterns of Tm1/3TaO3 reveal this has a complex incommensurate structure. Likewise Gd1/3TaO 3 appears metrically tetragonal, but electron diffraction and synchrotron X-ray powder diffraction demonstrate this is actually orthorhombic. The suppression of the spontaneous orthorhombic strain in Gd 1/3TaO3 is thought to be due to the proximity to the first-order Cmmm-Pmma transition. Variable temperature studies show both Tb 1/3TaO3 and Dy1/3TaO3 undergo a first-order Cmmm-Pmma transition upon heating.",

author = "Qingdi Zhou and Saines, {Paul J.} and Neeraj Sharma and Jimmy Ting and Kennedy, {Brendan J.} and Zhaoming Zhang and Withers, {Ray L.} and Wallwork, {Kia S.}",

year = "2008",

month = nov,

day = "11",

doi = "10.1021/cm8014868",

language = "English",

volume = "20",

pages = "6666--6676",

journal = "Chemistry of Materials",

issn = "0897-4756",

publisher = "American Chemical Society",

number = "21",

}

TY - JOUR

T1 - Crystal structures and phase transitions in a-site deficient perovskites Ln1/3TaO3

AU - Zhou, Qingdi

AU - Saines, Paul J.

AU - Sharma, Neeraj

AU - Ting, Jimmy

AU - Kennedy, Brendan J.

AU - Zhang, Zhaoming

AU - Withers, Ray L.

AU - Wallwork, Kia S.

PY - 2008/11/11

Y1 - 2008/11/11

N2 - The synthesis and structures of the perovskites Ln1/3TaO 3 are described. As the size of the Ln cation is reduced, the compounds display a sequence of structure: P4/mmm/La → Cmmm/Ce-Gd → Pmma/Tb, Dy → Pmc21/Ho, Er. Although apparently tetragonal in P4/mmm, electron diffraction patterns of Tm1/3TaO3 reveal this has a complex incommensurate structure. Likewise Gd1/3TaO 3 appears metrically tetragonal, but electron diffraction and synchrotron X-ray powder diffraction demonstrate this is actually orthorhombic. The suppression of the spontaneous orthorhombic strain in Gd 1/3TaO3 is thought to be due to the proximity to the first-order Cmmm-Pmma transition. Variable temperature studies show both Tb 1/3TaO3 and Dy1/3TaO3 undergo a first-order Cmmm-Pmma transition upon heating.

AB - The synthesis and structures of the perovskites Ln1/3TaO 3 are described. As the size of the Ln cation is reduced, the compounds display a sequence of structure: P4/mmm/La → Cmmm/Ce-Gd → Pmma/Tb, Dy → Pmc21/Ho, Er. Although apparently tetragonal in P4/mmm, electron diffraction patterns of Tm1/3TaO3 reveal this has a complex incommensurate structure. Likewise Gd1/3TaO 3 appears metrically tetragonal, but electron diffraction and synchrotron X-ray powder diffraction demonstrate this is actually orthorhombic. The suppression of the spontaneous orthorhombic strain in Gd 1/3TaO3 is thought to be due to the proximity to the first-order Cmmm-Pmma transition. Variable temperature studies show both Tb 1/3TaO3 and Dy1/3TaO3 undergo a first-order Cmmm-Pmma transition upon heating.

UR - http://www.scopus.com/inward/record.url?scp=57049096408&partnerID=8YFLogxK

U2 - 10.1021/cm8014868

DO - 10.1021/cm8014868

M3 - Article

SN - 0897-4756

VL - 20

SP - 6666

EP - 6676

JO - Chemistry of Materials

JF - Chemistry of Materials

IS - 21

ER -

Crystal structures and phase transitions in a-site deficient perovskites Ln_1/3TaO₃

Abstract

Access to Document

Other files and links

Fingerprint

Cite this